feat(executor/web): implement next window (#226)

* Add gecko web driver

* Add a new statement to switch to next windows

* Add documentation with an example

executors/web/README.md

@@ -46,6 +46,34 @@ testcases:
 
 ```
 
+Next Window action allow you to change the current window
+Next Window have one boolean parameter, this parameter must be true
+Example:
+
+```yaml
+name: TestSuite NextWindow
+testcases:
+- name: TestCase NextWindow 
+  context:
+    type: web
+    driver: chrome
+    debug: true
+  steps:
+  - action:
+      navigate:
+        url: https://javascript.info/popup-windows
+  - action:
+      click:
+        find: article > div:nth-child(3) > div:nth-child(17) a[data-action='run']
+        wait: 4
+    screenshot: beforeNextWindow.png
+  - action:
+      nextWindow: true
+    screenshot: resultNextWindow.png
+    assertions:
+      - result.url ShouldStartWith https://www.google.com
+```
+
 ## Output
 
 * result.url

executors/web/types.go

@@ -7,6 +7,7 @@ type Action struct {
 	Find     string    `yaml:"find,omitempty"`
 	Navigate *Navigate `yaml:"navigate,omitempty"`
 	Wait     int64     `yaml:"wait,omitempty"`
+	NextWindow bool	   `yaml:"nextWindow,omitempty"`
 }
 
 // Fill represents informations needed to fill input/textarea

executors/web/web.go

@@ -110,6 +110,10 @@ func (Executor) Run(testCaseContext venom.TestCaseContext, l venom.Logger, step
 		}
 	} else if e.Action.Wait != 0 {
 		time.Sleep(time.Duration(e.Action.Wait) * time.Second)
+	} else if ( e.Action.NextWindow ) {
+		if err := ctx.Page.NextWindow(); err != nil {
+			return nil, err
+		}
 	}
 
 	// take a screenshot